(Posting in the right forum this time... Apologies for any inconveniences caused to mod staff.) For some reason, a WIP car mod I'm making loses between 20% and 95% of engine power between the gearbox and the wheels with the AWD transfer case equipped, whereas the RWD transfer case behaves as normal. (1080p viewing recommended for clarity) Below is a list of the friction and inertia values of the Scintilla's powertrain (since it served as the base for that of my car) versus my car's. Friction + Dynamic Friction Scintilla Engine (V10): 13 + 0.025 Gearbox (6SQ): 1.48 + 0.0014 (Torque Loss 0.012) Transfer Case (Race AWD): 1.6 + 0.0005 (Torque Loss 0.01) Front Driveshaft: 1 Front / Rear Diffs (Race LSD): 4.13 F / 5.16 R + 0.00195 F / 0.00295 R (Torque Loss 0.03) Front / Rear Halfshafts: 1.65 + 0.00407 My Car Engine: 10 + 0.025 Gearbox (7SQ): 1.24 + 0.001 (Torque Loss 0.008) Transfer Case (Race AWD): 1.65 + 0.00054 (Torque Loss 0.0105) Front Driveshaft: 1 Front / Rear Diffs (Race LSD): 3.96 F / 4.96 R + 0.0018 F / 0.0028 R (Torque Loss 0.024) Front / Rear Halfshafts: 1.6 + 0.004 Inertia Scintilla Engine (V10): 0.1 Transfer Case (Race AWD): 0.1 Front / Rear Diffs (Race LSD): 0.25 My Car Engine: 0.046 Transfer Case (Race AWD): 0.1 Front / Rear Diffs (Race LSD): 0.22 Since RWD power loss in my car is well within acceptable levels, I think it's safe to rule out the halfshafts, diffs, and gearbox/FD ratios as the cause of this issue, but that doesn't get me any closer to identifying and fixing it. Are the friction and inertia values out of whack relative to each other? Do the friction and dynamic friction values just add up to something effectively acting as a brake?
Are your front and rear tires different diameters? If not, the dinal drive ratios MUST be the same. On the Scintilla, there's a overdrive for the front axle because the front tires are smaller in diameter than the rear tires on the road configs. Try using equal tires and drive ratios and look if the issue persists
It may not be all that clear in the video, but both AWD tests used the 19x12 C70 wheels all around (the only tire option being 345/35R19 slicks), and both diff FD ratios were the same (3.3:1).
Man, that's really weird. What kind of transfercase are you using? Is it a Splitshaft, or a differential?
As per the Scintilla race transfer case, it's a clutch-type LSD with these parameters: ["differential", "transfercase", "gearbox", 1, {"primaryOutputID":1, "diffType":"lsd", "lsdPreload":"$lsdpreload_C", "lsdLockCoef":"$lsdlockcoef_C", "lsdRevLockCoef":"$lsdlockcoefrev_C", "diffTorqueSplit":"$difftorquesplit_C", "friction":1.6, "dynamicFriction":0.0005, "torqueLossCoef":0.01, "uiName":"Center Differential","defaultVirtualInertia":0.1,"speedLimitCoef":0.1}],
I don't remember a differential needing the "primaryOutputID". Try removing that part and look if that solves. Other option would be trying to use other kinds of transfercases, like the Splitshat, either the viscous or the Clutchex
Removing the primaryOutputID parameter had no effect on power loss. Having just tested a (non-active) split shaft-based transfer case, power losses have been decreased, but only slightly (power ratio still drops to 0.23 in 7th gear at 395 kph). On top of that, the power split can only be adjusted indirectly via locking torque, and there is an overabundance of engine braking. As the power ratio consistently decreases with higher wheel speeds, I think my next step will be to take a look at the front spindles (also because the below happens, which I've only seen elsewhere on this mod if I don't equip all the right parts).
It might sound crazy, but did you test it as a FWD? That would prove that the issue is in the front spindles
Thanks for the suggestion! Huh, looks like it's fine as long as it's only one axle that's being driven...
That's REALLY weird. Probably the issue is on the AWD system. Are the diffs/Driveshaft using the proper output from the transfercase? That issue is really strange
I believe so, as the rear diff has an input index of 1, and the driveshaft torsion reactor (which in turn feeds into the driveshaft proper) has an input index of 2. The test FWD transfer case uses "outputPortOverride":[2] to force itself to connect to the torsion reactor instead of the rear diff.
So I found this in the console: transfercase: Found non-matching gear ratios for differential outputs: A: '1.0000', B: '3.3000', A(max): '1.0000', B(max): '3.3000' This hints at some sort of mismatch between the transfercase and front final drive, but aside from the gearRatio:1 in the front driveshaft (the deletion of which also changed nothing), no other gear ratios are declared between the gearbox and front/rear final drives. The powertrain diagram here displays everything as connected, so although the source of the problem has been pinpointed, I'm barely any closer to fixing it.
One look at the vehicle editor powertrain inspector later, the front FD ratio was set to 1 for some reason, and... Yeah, a typo. Oops... at least the diagnostic tools were there to help me pick up where the console left off.
When the difference between two output are too high, the input torque will be eaten by the differential(making it less realistic), this reduces both output(not making it limited slip but turning it to 0.0 it may increase efficiency of the powertrain) I initial discovered the phenomenon here
